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          c语言 用循环链表实现约瑟夫环
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        <p>用C语言实现约瑟夫环</p>
<a id="more"></a>
<pre><code>#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;

// 链表结构体
struct ListNode
{
    int val;
    struct ListNode * next;
};

// 创建循环链表
struct ListNode * create(int n)
{
    struct ListNode * head = (struct ListNode *)malloc(sizeof(struct ListNode));
    struct ListNode *q = head;
    head-&gt;val = 1;
    head-&gt;next = NULL;
    int i = 2;
    while(i&lt;=n){
        struct ListNode *p = (struct ListNode *)malloc(sizeof(struct ListNode));
        p-&gt;val = i;
        p-&gt;next = NULL;
        q-&gt;next = p;
        q = p;
        i++;
    }

    q-&gt;next = head;
    return head;

}

int main()
{
    struct ListNode * head = create(2);
    struct ListNode * p = head;
    struct ListNode * q = head;
    int i=1;
    while(1)
    {

        if(i%3==0)
        {
            if(p-&gt;next == q)
            {
                q-&gt;next = NULL;
                break;
            }
            q-&gt;next = p-&gt;next;
            i=1;
        }
        else
        {
            i++;
        }
        q = p;
        p = p-&gt;next;        

    }

    // q就是最后剩下的
    printf(&quot;%d &quot;, q-&gt;val);

    return 0;
}
</code></pre><p>主要的思想就是用循环链表来实现。但其他语言 例如 pyhon/php 有更简单的实现方法。</p>

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